U.S. patent application number 14/720544 was filed with the patent office on 2016-01-21 for display system having module display panel with circuitry for bidirectional communication.
The applicant listed for this patent is Ultravision Technologies, LLC. Invention is credited to William Y. Hall.
Application Number | 20160019831 14/720544 |
Document ID | / |
Family ID | 55075047 |
Filed Date | 2016-01-21 |
United States Patent
Application |
20160019831 |
Kind Code |
A1 |
Hall; William Y. |
January 21, 2016 |
Display System having Module Display Panel with Circuitry for
Bidirectional Communication
Abstract
A modular display panel includes a plastic housing having a
recess, a printed circuit board disposed in the recess, a plurality
of light emitting diodes (LEDs) attached to the printed circuit
board, a transparent potting compound overlying the LEDs, a driver
circuit attached to the printed circuit board, and a heat sink
disposed between a back side of the housing and the printed circuit
board. The heat sink thermally contacts the back side of the
housing and the printed circuit board. The panel also includes a
power supply and a network interface controller.
Inventors: |
Hall; William Y.; (Dallas,
TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Ultravision Technologies, LLC |
DALLAS |
TX |
US |
|
|
Family ID: |
55075047 |
Appl. No.: |
14/720544 |
Filed: |
May 22, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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62158989 |
May 8, 2015 |
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62113342 |
Feb 6, 2015 |
|
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62093157 |
Dec 17, 2014 |
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62065510 |
Oct 17, 2014 |
|
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62025463 |
Jul 16, 2014 |
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Current U.S.
Class: |
345/212 ;
345/82 |
Current CPC
Class: |
G09G 2320/0633 20130101;
G06F 2200/1612 20130101; G09G 3/3413 20130101; G09G 3/3426
20130101; G09G 2354/00 20130101; G09G 2320/0693 20130101; G06F
3/1446 20130101; G09G 5/003 20130101; G09G 3/3208 20130101; G09G
2310/024 20130101; G09G 2360/04 20130101; G09G 2320/062 20130101;
G09G 3/3233 20130101; G09G 2330/02 20130101; G09G 2330/12 20130101;
G06F 1/20 20130101; G09G 3/2096 20130101; G09G 2360/144 20130101;
G09G 3/32 20130101; G09G 3/3406 20130101; G09G 2380/06 20130101;
G09F 2013/222 20130101; G09G 2370/04 20130101; G09G 3/006 20130101;
G09F 13/22 20130101; G09F 15/0006 20130101; G06F 1/1601 20130101;
G09G 2310/0235 20130101; G09G 2300/026 20130101; G09G 2320/064
20130101; G09G 2360/14 20130101; G09G 2360/141 20130101; G09G
2320/041 20130101; G09G 2360/145 20130101; G09G 2360/16
20130101 |
International
Class: |
G09G 3/32 20060101
G09G003/32; G09G 3/34 20060101 G09G003/34; G09G 3/20 20060101
G09G003/20; G06F 1/16 20060101 G06F001/16 |
Claims
1. A modular display panel comprising: a plastic housing having a
recess; a printed circuit board disposed in the recess; a plurality
of LEDs attached to the printed circuit board; a potting compound
disposed over the printed circuit board; a driver circuit attached
to the printed circuit board; a heat sink disposed between a back
side of the housing and the printed circuit board, the heat sink
thermally contacting the back side of the housing and the printed
circuit board; a power supply; and a network interface controller
comprising a media access control (MAC) address.
2. The display panel of claim 1, wherein the power supply is
mounted within the plastic housing.
3. The display panel of claim 1, wherein the network interface
controller is mounted within the plastic housing.
4. The display panel of claim 1, wherein the network interface
controller is mounted outside the plastic housing.
5. The display panel of claim 1, further comprising a sensor to
detect an ambient lighting parameter and a processor to set the
display lighting in accordance with the detected ambient lighting
parameter.
6. The display panel of claim 1, wherein the network interface
controller is configured to transmit and receive data.
7. The display panel of claim 1, wherein the network interface
controller is configured to transmit and receive data using an
internet communications protocol.
8. The display panel of claim 1, wherein the network interface
controller is configured to transmit and receive data using a near
field communication protocol.
9. The display panel of claim 1, wherein the network interface
controller is configured to enable a unique IP address for each
display panel.
10. The panel of claim 1, further comprising: a first integrated
data and power cable extending through the back side of the housing
and electrically coupled to the printed circuit board and the power
supply; and a second integrated data and power cable extending
through the back side of the housing and electrically coupled to
the printed circuit board and the power supply.
11. The display panel of claim 10, wherein the first integrated
data and power cable and the second integrated data and power cable
comprise Ethernet cables compatible with Power over Ethernet
specifications.
12. The panel of claim 1, further comprising a framework of louvers
disposed over the printed circuit board, the framework of louvers
disposed between rows of the LEDs, wherein the framework of louvers
is attached to the printed circuit board using an adhesive
configured to prevent moisture from reaching the printed circuit
board.
13. The panel of claim 1, wherein the heat sink physically contacts
both the back side of the plastic housing and the printed circuit
board.
14. The panel of claim 1, further comprising thermal grease
disposed between the back side of the plastic housing and the
printed circuit board.
15. The panel of claim 14, wherein the thermal grease is between
the heat sink and the back side of the plastic housing.
16. The panel of claim 14, wherein the thermal grease is between
the heat sink and the printed circuit board.
17. The panel of claim 14, wherein the thermal grease is both
between the heat sink and the back side of the plastic housing and
between the heat sink and the printed circuit board.
18. The panel of claim 1, wherein the power supply comprises a
power converter for converting AC power to DC power.
19. The panel of claim 1, wherein the power supply comprises a down
converter that down converts a DC voltage at a first level to a DC
voltage at a second level that is lower than the first level.
20. The panel of claim 1, wherein the panel is sealed to an IP 67
standard.
21. A display panel comprising: a plurality of display elements; a
housing enclosing the display elements, the housing being sealed
with respect to external elements; a first enclosure disposed
outside the housing and mounted to a back side of the housing, the
first enclosure comprising a power supply circuitry for supplying
power to the plurality of display elements; and a second enclosure
disposed outside the housing and mounted to the back side of the
housing, the second enclosure comprising a media processing chip
comprising a network interface card coupled to the plurality of
display elements.
22. The display panel of claim 21, wherein the first enclosure and
the second enclosure are part of a common enclosure.
23. The display panel of claim 21, wherein the first enclosure is
spaced apart from the second enclosure.
24. A modular multi-panel display system comprising: a mechanical
support structure; and a plurality of display panels mounted to the
mechanical support structure so as to form an integrated display
panel; wherein each one of the plurality of display panels
comprises a media processing chip comprising a network interface
card configured to enable bidirectional communication; wherein ones
of the display panels each include a first integrated data and
power input point connected to a first adjacent display panel to
receive data and alternating current (AC) power from the first
adjacent display panel; and wherein the ones of the display panels
each also include a second integrated data and power input point
connected to a second adjacent display panel to provide data and AC
power to the second adjacent display panel.
25. The system of claim 24, wherein each display panel comprises: a
plurality of display elements; a housing enclosing the display
elements, the housing being sealed with respect to external
elements; and a common enclosure disposed outside the housing and
mounted to a back side of the housing, the common enclosure
comprising a power supply circuitry for supplying power to the
plurality of display elements, wherein the network interface card
is disposed in the common enclosure.
26. The system of claim 24, wherein the display panels are arranged
in an array of rows and columns, each LED display panel of each row
being electrically connected to an adjacent LED display panel
within that row via an integrated data and power cable.
27. The system of claim 26, wherein, a first panel of the plurality
of display panels in a row comprises a unique IP address.
28. The system of claim 24, wherein the network interface card is
configured to transmit and receive data using an internet
communications protocol.
29. The system of claim 24, wherein the network interface card is
configured to transmit and receive data using a near field
communication protocol.
30. The system of claim 24, wherein the network interface card is
configured to enable a unique IP address for each display panel.
Description
[0001] The present application claims priority to the following
applications: U.S. Provisional Application 62/158,989 filed on May
8, 2015 (Attorney Docket Number UVI 015P), U.S. Provisional
Application 62/113,342 filed on Feb. 6, 2015 (Attorney Docket
Number UVI 013P), U.S. Provisional Application No. 62/093,157,
filed on Dec. 17, 2014 (Attorney Docket Number UVI 012P), U.S.
Provisional Application No. 62/065,510, filed on Oct. 17, 2014
(Attorney Docket Number UVI 011P), U.S. Provisional Application No.
62/025,463, filed on Jul. 16, 2014 (Attorney Docket Number UVI
007P). These applications are incorporated herein by reference.
TECHNICAL FIELD
[0002] The present invention relates generally to a display panels
and systems, and, in particular embodiments, to display system
having modular display panel with circuitry for bidirectional
communication.
BACKGROUND
[0003] Large displays (e.g., billboards), such as those commonly
used for advertising in cities and along roads, generally have one
or more pictures and/or text that are to be displayed under various
light and weather conditions. As technology has advanced and
introduced new lighting devices such as the light emitting diode
(LED), such advances have been applied to large displays. An LED
display is a flat panel display, which uses an array of
light-emitting diodes. A large display may be made of a single LED
display or a panel of smaller LED panels. LED panels may be
conventional panels made using discrete LEDs or surface-mounted
device (SMD) panels. Most outdoor screens and some indoor screens
are built around discrete LEDs, which are also known as
individually mounted LEDs. A cluster of red, green, and blue
diodes, or alternatively, a tri-color diode, is driven together to
form a full-color pixel, usually square in shape. These pixels are
spaced evenly apart and are measured from center to center for
absolute pixel resolution.
[0004] Many LED display manufacturers sell displays with different
resolutions. A present disadvantage of these LED displays is that
each one must be a different size to accommodate the pitch needed
to obtain the desired resolution. In turn, the existing cabinets
and mounting structures must be built to be suitable with the size
of the displays.
SUMMARY
[0005] In accordance with an embodiment of the present invention, a
modular display panel includes a plastic housing having a recess, a
printed circuit board disposed in the recess, a plurality of light
emitting diodes (LEDs) attached to the printed circuit board, a
transparent potting compound overlying the LEDs, a driver circuit
attached to the printed circuit board, and a heat sink disposed
between a back side of the housing and the printed circuit board.
The heat sink thermally contacts the back side of the housing and
the printed circuit board. The panel also includes a power supply
and a network interface controller.
[0006] In accordance with another embodiment of the present
invention, a display panel includes a plurality of display
elements, and a housing enclosing the display elements. The housing
is sealed with respect to external elements. A first enclosure is
disposed outside the housing and mounted to a back side of the
housing. The first enclosure includes a power supply circuitry for
supplying power to the plurality of display elements. A second
enclosure is disposed outside the housing and mounted to the back
side of the housing. The second enclosure includes a media
processing chip including a network interface card coupled to the
plurality of display elements.
[0007] A modular multi-panel display system includes a mechanical
support structure, and a plurality of display panels mounted to the
mechanical support structure so as to form an integrated display
panel. Each one of the plurality of display panels includes a media
processing chip including a network interface card configured to
enable bidirectional communication, where ones of the display
panels each include a first integrated data and power input point
connected to a first adjacent display panel to receive data and AC
power from the first adjacent display panel, and where the ones of
the display panels each also include a second integrated data and
power input point connected to a second adjacent display panel to
provide data and AC power to the second adjacent display panel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] For a more complete understanding, reference is now made to
the following description taken in conjunction with the
accompanying drawings in which:
[0009] FIG. 1 illustrates a modular display panel in accordance
with an embodiment of the present invention;
[0010] FIG. 2 illustrates a modular display panel attached to a
supporting frame in accordance with an embodiment of the present
invention;
[0011] FIG. 3 illustrates a frame used to provide mechanical
support to the modular display panel in accordance with an
embodiment of the present invention.
[0012] FIG. 4 illustrates one LED display panel of the multi-panel
modular preassembled display unit comprising an input cable and an
output cable;
[0013] FIG. 5 illustrates two display panels next to each other and
connected through the cables such that the output cable of the left
display panel is connected with the input cable of the next display
panel;
[0014] FIG. 6 illustrates a modular multi-panel display system
comprising a plurality of LED display panels connected together
using the afore-mentioned cables;
[0015] FIGS. 7A and 7B, illustrates a display panel in accordance
with an embodiment of the present invention, wherein FIG. 7A
illustrates a cross-sectional view of a display panel while FIG. 7B
illustrates a system diagram schematic of the display panel in
accordance with an embodiment of the present invention;
[0016] FIG. 8 illustrates an alternative system diagram schematic
of the display panel in accordance with an embodiment of the
present invention;
[0017] FIG. 9 illustrates an embodiment of the present invention
describing a monitoring controller disposed within a data receiver
box;
[0018] FIG. 10 illustrates an alternative embodiment, in which the
data receiver box also has wireless connectivity;
[0019] FIG. 11 illustrates a general schematic of a monitoring
circuit in accordance with an embodiment of the present
invention;
[0020] FIG. 12 illustrates an embodiment of the present invention
in which the display panels are connected serially;
[0021] FIG. 13A illustrates a back side of an individual LED
display panel in accordance with an embodiment of the present
invention;
[0022] FIG. 13B illustrates a more detailed schematic of the
circuit with a LED circuit showing a separate TX-RX circuit for
establishing bidirectional communication;
[0023] FIG. 14 illustrates an embodiment of the display system in
which the data receiver box has minimal functionality;
[0024] FIG. 15 illustrates an alternative embodiment of the present
invention; and
[0025] FIG. 16 illustrates an alternative embodiment of the present
invention in which each display panel has a unique IPV6 IP
address.
DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
[0026] In the following discussion, exterior displays are used
herein for purposes of example. It is understood that the present
disclosure may be applied to lighting for any type of interior
and/or exterior display.
[0027] Installation of large display panels is a labor intensive
process requiring skilled labor working in dangerous conditions for
extended times. For example, to install a conventional display on a
large multi-story building, the installers have to climb to the
mounting wall (typically many stories high) and individually screw
in each display and the corresponding cables etc. This is both time
consuming and poses a significant safety threat thereby increasing
the cost of the system dramatically.
[0028] Further, it is very difficult to know when a panel becomes
defective. Typically, an observer or a customer has to take notice
and inform the operator of the billboard when one or more panels
are not functioning or functioning poorly. Embodiments of the
present invention overcome these and other limitations by enabling
bidirectional communication in which the billboard includes
intelligence to initiate the replacement.
[0029] Further, when a particular display becomes defective during
operation, the cost of replacement can be very high due to need for
a highly skilled person to work in such difficult working
conditions. The defective display has to be individually removed
and replaced from the housing or cabinet in which it is
mounted.
[0030] Embodiments of the invention provide preassembled display
panel units, each of which provides a completely self-contained
building block that is lightweight. Consequently, replacement of
defective units is very simple and a person with no skill can
easily remove and replace a defective display. Accordingly,
embodiments of the present invention significantly reduce the
operating cost of the display.
[0031] These display units are designed to be weather proof,
without a heavy cabinet, although it is understood that the present
disclosure may be applied to lighting for any type of interior
and/or exterior display. The lightweight design allows for easier
installation and maintenance, thus lowering total cost of
ownership.
[0032] Embodiments of the invention provide building block panels
that are configurable with future expandability. These displays can
offer complete expandability to upgrade in the future without
having to replace the entire display. Installation is fast and easy
with very little down-time, which allows any electronic message to
be presented more quickly.
[0033] In various embodiments, the display panels are "hot
swappable." By removing one screw in each of the four corners of
the panel, servicing the display panel is fast and easy. Since a
highly-trained, highly-paid electrician or technician is not needed
to correct a problem, cost benefits can be achieved.
[0034] Embodiments of the invention relate to lighting systems and,
more particularly, to multi-panel lighting systems for providing
interior or exterior displays.
[0035] FIG. 1 illustrates a modular display panel in accordance
with an embodiment of the present invention. FIG. 2 illustrates a
modular display panel attached to a supporting frame in accordance
with an embodiment of the present invention. FIG. 3 illustrates a
frame used to provide mechanical support to the modular display
panel in accordance with an embodiment of the present
invention.
[0036] The multi-panel modular preassembled display unit 10
comprises a plurality of LED display panels 50. In various
embodiments describe herein, the light emitting diode (LED) display
panels 50 are attached to a frame 20 or skeletal structure that
provides the framework for supporting the LED display panels 50.
The LED display panels 50 are stacked next to each other and
securely attached to the frame 20 using attachment plate 30, which
may be a corner plate in one embodiment. The attachment plate 30
may comprise holes through which attachment features 90 may be
screwed in, for example.
[0037] In various embodiments, the preassembled display unit 10 may
be used in a window display, billboard display, or other types of
displays such as video walls, personal display screens and others.
The preassembled display unit 10 may be sound enabled, for example,
coupled to a common sound system in some embodiments. The sound
system may be activated or deactivated depending on external
conditions such as the presence of a user in some embodiments.
[0038] Referring to FIGS. 1 and 2, the LED display panels 50 are
arranged in an array of rows and columns. Each LED display panel 50
of each row is electrically connected to an adjacent LED display
panel 50 within that row.
[0039] Referring to FIG. 3, the frame 20 provides mechanical
support and electrical connectivity to each of the LED display
panels 50. The frame 20 comprises a plurality of beams 32 forming
the mechanical structure. The frame 20 comprises a top bar, a
bottom bar, a left bar, a right bar, and a plurality of vertical
bars extending from the top bar to the bottom bar, the vertical
bars disposed between the left bar and the right bar. The top bar,
the bottom bar, the left bar and the right bar comprise four inch
aluminum bars and wherein the vertical bars comprise
2''.times.4''.times.1/2'' aluminum tubes. The top bar, the bottom
bar, the left bar and the right bar are each capable of bearing a
load of 1.738 lb/ft and the vertical bars are each capable of
bearing a load of 3.23 lb/ft.
[0040] The size of the individual panels may vary, for example, may
be 2 ft .times.3 ft, 3 ft.times.4 ft, as examples. For example, a
display system could include 336 panels that are each 1'.times.2'
in dimension to create a 14'.times.48' display. In such a display,
because each panel is lighter than typical panels, the entire
display could be built to weigh only 5500 pounds. This compares
favorably to commercially available displays of the size, which
generally weigh from 10,000 to 12,000 pounds. In another
embodiment, a display system could include 320 LED display panels
50 arranged in ten rows and thirty-two columns so that the
integrated display panel 100 has a display surface that is
approximately fifty feet and four inches wide and fifteen feet and
eight and three-quarters inches high. In other embodiments,
displays with an arbitrary number of panels can be used.
[0041] The frame 20 may include support structures for the
electrical cables, data cables, electrical power box powering the
LED display panels 50, data receiver box controlling power, data,
and communication to the LED display panels 50.
[0042] However, the frame 20 does not include any additional
enclosures to protect the LED panels, data, power cables from the
environment. Rather, the frame 20 is exposed to the elements and
further exposes the LED display panels 50 to the environment. The
frame 20 also does not include air conditioning, fans, heating
units to maintain the temperature of the LED display panels 50.
Rather, the LED display panels 50 are hermetically sealed
themselves and are designed to be exposed to the outside ambient.
Further, in various embodiments, there are no additional cabinets
that are attached to the frame 20 or used for housing the LED
display panels 50. Accordingly, in various embodiments, the
multi-panel modular preassembled display unit 10 is designed to be
only passively cooled.
[0043] FIG. 4 illustrates one LED display panel 50 of the
multi-panel modular preassembled display unit 10 comprising an
input cable 160 and an output cable 165. The LED display panels 50
are electrically connected together for data and for power using
the input cable 160 and the output cable 165.
[0044] Each modular LED display panel 50 is capable of receiving
input using an integrated data and power cable from a preceding
modular LED display panel and providing an output using another
integrated data and power cable to a succeeding modular LED display
panel. Each cable ends with an endpoint device or connector, which
is a socket or alternatively a plug.
[0045] Referring to FIG. 4, in accordance with an embodiment, a LED
display panel 50 comprises an attached input cable 160 and an
output cable 165, a first connector 170, a second connector 175, a
sealing cover 180. The sealing cover 180 is configured to go over
the second connector 175 thereby hermetically sealing both ends
(first connector 170 and the second connector 175). The sealing
cover 180, which also includes a locking feature, locks the two
cables together securely. The input cable 160 and the output cable
1365 comprise integrated data and power wires with appropriate
insulation separating them.
[0046] FIG. 5 illustrates two display panels next to each other and
connected through the cables such that the output cable 165 of the
left display panel 50A is connected with the input cable 160 of the
next display panel 50B. The sealing cover 180 locks the two cables
together as described above. In alternative embodiments, each of
the panels 50A and 50B comprise a connector or a jack and a single
cable connects the adjacent panels.
[0047] FIG. 6 illustrates a modular multi-panel display system
comprising a plurality of LED display panels connected together
using the afore-mentioned cables.
[0048] Referring to FIG. 6, for each row, a LED display panel 50 at
a first end receives an input data connection from a data source
and has an output data connection to a next LED display panel in
the row. Each further LED display panel 50 provides data to a next
adjacent LED display panel until a LED display panel 50 at second
end of the row is reached. The power line is run across each row to
power the LED display panels 50 in that row.
[0049] In one embodiment, the plurality of LED display panels 50
are arranged in ten rows and thirty-two columns so that the
integrated display panel 100 has a display surface that is
approximately fifty feet and four inches wide and fifteen feet and
eight and three-quarters inches high.
[0050] In various embodiments, as illustrated in FIGS. 2 and 6, a
data receiver box 40 is mounted to the mechanical support structure
or frame 20. The data receiver box 40 is configured to provide
power, data, and communication to the LED display panels 50. With a
shared data receiver box 40, the panels themselves do not need
their own receiver card. This configuration saves cost and
weight.
[0051] FIGS. 7A and 7B, illustrates a display panel in accordance
with an embodiment of the present invention. FIG. 7A illustrates a
cross-sectional view of a display panel while FIG. 7B illustrates a
schematic of the display panel.
[0052] Referring to FIG. 7A, the modular LED display panel
comprises a plurality of LEDs 710 mounted on one or more printed
circuit boards (PCBs) 720, which are housed within a hermetically
sealed enclosure or casing. A framework of louvers 730 is attached
to the PCB 720 using an adhesive 740, which prevents moisture from
reaching the PCB. However, the LEDs 710 are directly exposed to the
ambient in the direction of light emission. The LEDs 710 are
themselves water repellent and therefore are not damaged even if
exposed to water. The louvers 730 rise above the surface of the
LEDs and help to minimize reflection and scattering of external
light, which can otherwise degrade the quality of light output from
the LEDs 710.
[0053] The PCB is mounted within a cavity of an enclosure, which
may be a plastic casing 745. A heat sink 760 is attached between
the PCB 720 and the casing 745 and contacts both the PCB 720 and
the casing 745 to maximize heat extraction. A thermal grease may be
used between the back side of the casing 745 and the PCB 720 to
improve thermal conduction. In one example embodiment, the thermal
grease is between the heat sink 760 and the back side of the casing
745. In a further example embodiment, the thermal grease is between
the PCB 720 and the heat sink 760.
[0054] A receiver circuit 725 is mounted on the PCB 1620. The
receiver circuit 725 may be a single chip in one embodiment.
Alternatively, multiple components may be mounted on the PCB 720.
The receiver circuit 725 may be configured to process the received
media and control the operation of the individual LEDs 710. For
example, the receiver circuit 725 may determine the color of the
LED to be displayed at each location (pixel). Similarly, the
receiver circuit 725 may determine the brightness at each pixel
location, for example, by controlling the current supplied to the
LED.
[0055] The air gap within the cavity is minimized so that heat is
conducted out more efficiently. Thermally conductive standoffs 726
may be introduced between the PCB 720 to minimize the air gap, for
example, between the receiver circuit 725 and the heat sink 760.
The PCB 720 is designed to maximize heat extraction from the LEDs
710 to the heat sink 760. As described previously, the casing 745
of the display panel 750 has openings through which an input cable
1360 and output cable 1365 may be attached. The cables may have
connectors or plugs for connecting to an adjacent panel or
alternatively the casing 745 may simply have input and output
sockets.
[0056] A power supply unit 770 may be mounted over the casing 745
for powering the LEDs 710. The power supply unit 770 may comprise a
LED driver in various embodiments. The LED driver may include a
power converter for converting AC to DC, which is supplied to the
LEDs 710. Alternatively, the LED driver may comprise a down
converter that down converts the voltage suitable for driving the
LEDs 710. For example, the down converter may down convert a DC
voltage at a first level to a DC voltage at a second level that is
lower than the first level. This is done so that large DC currents
are not carried on the power cables. The LED driver is configured
to provide a constant DC current to the LEDs 710.
[0057] Examples of down converters (DC to DC converters) include
linear regulators and switched mode converters such as buck
converters. In further embodiments, the output from the power
supply unit 770 is isolated from the input power. Accordingly, in
various embodiments, the power supply unit 770 may comprise a
transformer. As a further example, in one or more embodiments, the
power supply unit 770 may comprise a forward, half-bridge,
full-bridge, push-pull topologies.
[0058] The power supply unit 770 may be placed inside a Faraday
cage to minimize RF interference to other components. The LED
driver of the power supply unit 770 may also include a control loop
for controlling the output current. In various embodiments, the
display panel 750 is sealed to an IP 67 standard. As discussed
herein, other ratings are possible.
[0059] FIG. 7B illustrates a system diagram schematic of the
display panel in accordance with an embodiment of the present
invention.
[0060] Referring to FIG. 7B, a data and power signal received at
the input cable 1360 is processed at an interface circuit 751. The
incoming power is provided to the LED driver 753. Another output
from the incoming power is provided to the output cable 1365. This
provides redundancy so that even if a component in the display
panel 750 is not working, the output power is not disturbed.
Similarly, the output cable 765 includes all the data packets being
received in the input cable 1360.
[0061] The interface circuit 751 provides the received data packets
to the graphics processor 757 through a receiver bus 754. In some
embodiments, the interface circuit 751 provides only the data
packets intended for the display panel 750. In other embodiment,
the interface circuit 751 provides all incoming data packets to the
graphics processor 757. For example, the graphics processor 757 may
perform any decoding of the received media. The graphics processor
757 may use the buffer memory 755 or frame buffer as needed to
store media packets during processing.
[0062] A scan controller 759, which may include an address decoder,
receives the media to be displayed and identifies individual LEDs
in the LEDs 710 that need to be controlled. The scan controller 759
may determine an individual LEDs color, brightness, refresh time,
and other parameters associated to generate the display. In one
embodiment, the scan controller 759 may provide this information to
the LED driver 753, which selects the appropriate current for the
particular LED.
[0063] Alternatively, the scan controller 759 may interface
directly with the LEDs 710 in one embodiment. For example, the LED
driver 753 provides a constant current to the LEDs 710 while the
scan controller 759 controls the select line needed to turn ON or
OFF a particular LED. Further, in various embodiments, the scan
controller 759 may be integrated into the LED driver 753.
[0064] FIG. 8 illustrates an alternative system diagram schematic
of the display panel in accordance with an embodiment of the
present invention.
[0065] Referring to FIG. 8, a data and power signal received at
first cable 360 is processed at an interface circuit 351 of
receiver circuit 325. The incoming power is provided to a power
supply unit 370.
[0066] Another output from the incoming power is provided to second
cable 365. This provides redundancy so that even if a component in
the LED display panel 150 is not working, the output power is not
disturbed. Similarly, second cable 365 includes all the data being
received in first cable 360.
[0067] In this embodiment, the interface circuit 351 provides the
received data to the graphics processor 357 through a data bus 354.
In some embodiments, the interface circuit 351 provides only the
data segments intended for the LED display panel 150. In other
embodiments, the interface circuit 351 provides all incoming data
to the graphics processor 357. For example, the graphics processor
357 may perform any necessary decoding or (when signaling between
panels is analog) analog-to-digital conversion of the received
media. In other embodiments, the interface circuit 351 interfaces
directly with the LED controller 359 without use of a graphics
processor 357. In the embodiment of FIG. 3B, the graphics processor
357, LED controller 359, or interface circuit 351 may use the
buffer video memory 355 as needed to store video segments during
processing. In some embodiments, the buffer video memory 355 may be
a component of the LED controller 359. The buffer video memory 355
may also be used to digitally store video segments temporarily
until the receiver circuit 325 collects enough data for
simultaneous display by the LEDs 310. This collection of data may
be a video frame for simultaneous display by all of the LEDs of the
display panel, or it may be a smaller portion of data for display
by a subset of the LEDs in accordance with, for example, a scanning
pattern. The buffer video memory 355 may also be used to
temporarily store video segments destined for other display
panels.
[0068] The LED controller 359, which may include an address decoder
(e.g., a demultiplexer), receives the media to be displayed and
identifies individual LEDs in the LEDs 310 that need to be
controlled. The LED controller 359 may determine an individual
LED's color, brightness, refresh time, and other parameters
associated to generate the display. For example, at each pixel
location in the display, the color of the pixel may be selected by
powering one or more combination of red, blue, green, and white
LEDs. The LED controller 359 may include control circuitry such as
a row selector and column selector for determining LED parameters
as an example. In one embodiment, the LED controller 359 may
provide these LED parameters to the current driver 353, which acts
as either a current source or a current sink to select the
appropriate current for the particular LED. In some embodiments,
the current driver 353 acts as a current source or sink to provide
a constant current with a constant pulse width to the LEDs 310. In
other embodiments, the current driver 353 varies the duty cycle of
a constant current to pulse width modulate the brightness of the
LEDs 310. The current driver 353 may either be a component of the
LED controller 359 or may be located outside the LED controller
359, such as, for example, being located inside the power supply
unit 370.
[0069] The power supply unit 370 may include, for example, a power
converter for converting AC to DC, which is supplied to the LEDs
310. Alternatively, the power supply unit 370 may include a down
converter that down converts the voltage suitable for driving the
LEDs 310.
[0070] In one embodiment, the power supply unit includes a scan
controller that interfaces directly with the LEDs 310. For example,
the current driver 353 may provide a constant current to the LEDs
310 while a scan controller of the power supply unit 370 controls
the select line needed to turn ON or OFF a particular LED. In some
embodiments, a scan controller of the power supply unit 370 is
implemented as an array of switches or transistors that switches
incoming power to a selected row or column of LEDs 310. In other
embodiments, the scan controller switches the output of the LED
controller 359 to a selected row or column. The scan controller
switches the LED controller output or power in accordance with, for
example, an LED address, a row address, a column address, a
pre-configured scanning pattern for scan groups of linked LEDs that
should be activated simultaneously, or a scan select signal that
specifies which scan group should be activated.
[0071] FIG. 9 illustrates an embodiment of the present invention
describing a monitoring controller 905 disposed within a data
receiver box 901. The monitoring controller 905 is configured to
monitor power failure in one or more display panels 950 and report
to the computer 1850 or to a different receiving monitoring server.
In various embodiments, the monitoring controller 905 is configured
to monitor illumination or brightness of one or more panels. The
monitoring controller 905 may also monitor the network between the
data receiver box 901 and the outside internet including computer
1850 as well as the local area network (or equivalent wireless
network) connecting the individual display panels 950 of the
display system 900.
[0072] The monitoring controller 905 may be used for other purposes
as well. For example, in one or more embodiments, the display
panels 950 may include one or more sensors to self-regulate
operation based on external conditions. For example, the sensor may
reduce or increase the brightness of the display panels based on
the ambient light. Alternatively, in some embodiments, the display
panels may sense the presence of an observer (e.g., human) and
modulate the content being displayed. For example, the display may
be powered off until a human approaches the display.
[0073] FIG. 10 illustrates an alternative embodiment, in which the
data receiver box 1001 also has wireless connectivity. The data
receiver box 1001 may include wired data connection as described in
FIG. 9, as well as wireless data connection as illustrated in FIG.
10. Accordingly, for example, if a network failure is detected, the
monitoring circuit 1005 may generate an error message, which is
then transmitted to a monitoring server or the computer 1850 using
the wireless channel.
[0074] FIG. 11 illustrates a general schematic of a monitoring
circuit in accordance with an embodiment of the present
invention.
[0075] In one or more embodiments, as illustrated in FIG. 11, a
monitoring circuit 1105 may include a power failure detecting
circuit 1145, a camera 1135, which may include both visible,
infrared and other spectrum to collect additional information. The
monitoring circuit 1105 may include a processor 1115 or may use the
common processor within the data receiver box. The camera may be
automatically periodically activated to image the display system.
The image may be processed to identify any issues with the display.
For example, using an image processing software executing on the
processor 1115, the power failure, dark pixels, lowered brightness
may be detected. In case of a failure, a failure message is
generated and transmitted to a monitoring server.
[0076] The monitoring circuit 1105 may include a memory 1125 to
store the images and the results of the processing. In one or more
embodiments, the monitoring circuit may include only a camera 1135.
In one embodiment, the camera 1135 may be a sensor to measure
brightness.
[0077] The processing may be performed remotely, for example, in
some embodiments. The camera 1135 may periodically capture images
of the display system and send the unprocessed image to a
monitoring server performing the remaining monitoring functions.
Accordingly, a more detailed image processing analysis may be
performed at the remote media server, which is likely to have
better computational power than the on-site processing at the
display.
[0078] FIG. 12 illustrates an embodiment of the present invention
in which the display panels 1250 are connected serially.
[0079] In this embodiment, each individual display panel 1250
includes a media processing chip comprising a network interface
card. Thus each panel has an individual media access control (MAC)
address, which enables each display panel 1250 to communicate in
both directions (receive and send data).
[0080] In one or more embodiments, the display panels 1250 may be
powered using a serial connection. In this embodiment, the use of a
monitoring circuit 1205 within the data receiver box 1200 may be
optional because each individual panel may be configured to
communicate bidirectionally. Accordingly, the functioning of the
monitoring circuit 1205 may be incorporated into the individual
panel. For example, each panel 1250 may include software and/or
hardware to perform the monitoring functions. If a defect is
identified within the panel 1250 (or on an adjacent panel), the
panel 1250 communicates the detection of the defect to the
controller 1800.
[0081] FIG. 13A illustrates a back side of an individual LED
display panel in accordance with an embodiment of the present
invention.
[0082] Referring to FIG. 13A, in one embodiment, the back side of
an individual LED panel 1350 has enclosures for attaching a power
conversion unit 1355 and a TX-RX circuit 1356. The TX-RX circuit
1356 may be a media processing chip comprising a network interface
controller, for example. In one or more embodiments, the power
conversion unit 1355 and the TX-RX circuit 1356 are both placed
within separate enclosures and mounted to the back side of the LED
display panel 1350. Alternatively, in one embodiment, the power
conversion unit 1355 and the TX-RX circuit 1356 are both placed
within the same enclosure and mounted to the back side of the LED
display panel 1350.
[0083] In a further embodiment, the TX-RX circuit 1356 may be
incorporated within the panel casing, for example, within the
receiver circuit 725 of FIG. 7A or mounted under the PCB 720 of
FIG. 7A as a separated chip.
[0084] FIG. 13B illustrates a more detailed schematic of the
circuit with a LED circuit 1325 showing a separate TX-RX circuit 56
and a monitoring circuit 1375 for monitoring the panel and
communicating using the established bidirectional communication.
The TX-RX circuit 56 may include a unique MAC address/network card
so that the device can be identified. In one or more embodiments, a
single media process chip may include, i.e., integrate more than
one component listed. For example, a single media processing chip
is used to power and render images using the LED 1310. The media
processing chip may include the functions of the TX-RX circuit 56,
interface circuit 1351, bus 1344, video memory 1346, graphics
processor 1357, scan controller 1359. The LED controller 1354 with
the LED driver 1353 may be part of a different chip or may also be
integrated.
[0085] The monitoring circuit 1375 may be implemented in software
and/or hardware and may be instructions to be performed using the
graphics processor 1357 or other processor available to the
monitoring circuit 1375. The monitoring circuit 1375 may also
include sensors such as temperature sensor, optical sensor
including ambient light sensor, magnetic sensor, current sensor,
power sensor, as well as other sensors. Based on the results from
the sensor, the monitoring circuit 1375 determines the need to
communicate with the receiver box or with a remote monitoring
computer. In one embodiment, an error message is generated by the
monitoring circuit 1375 identifying the type of defect and the ID
of the panel and then transmitted using the TX-RX circuit 56.
[0086] FIG. 14 illustrates an embodiment of the display system in
which the data receiver box 1400 has minimal functionality.
[0087] The data receiver box 1401 may simply connect the first
display panel of the display system 1400 with an interconnect
(TCP/IP) port. The first display panel may include an identifier
for the whole system so that the display system advertises a single
IP address. For example, the IP address of the display system 1400
may be identified from the first display panel 1450A. The remaining
panels 1450 may be daisy chained.
[0088] The media processing chip within each display panel 1450
identifies and processes the correct media that is to be displayed
from the data stream that includes all the media for all the panels
in the chain.
[0089] The first panel in the series of panels includes a unique IP
address. Thus, when connected to the internet, the network card at
the first display panel 1450A receives the data to be displayed by
all the panels within the same series. The remaining panels use the
data processed through the common network card at the first
network. The remaining panels have to be calibrated so that they
know which portion of the data is to be displayed by that
particular unit.
[0090] In one or more embodiments, the first display panel 1450A
may include a monitoring circuit for monitoring the status of one
or more panels being serviced by the first display panel 1450A.
[0091] FIG. 15 illustrates an alternative embodiment of the present
invention.
[0092] In this embodiment, a router 1501 is coupled between the
display panels 1550 and the internet. The router 1501 may be
coupled to a plurality of display panels 1550, where each panel has
its own network interface card each thereby having its unique MAC
address.
[0093] In some embodiments, the first display panel may include the
router 1501, i.e., the router 1501 may be integrated into the first
display panel. The devices within the local area of the router may
now be individually addressed using the display panels' 1550
respective MAC address. Accordingly, packets destined to each panel
are routed by the router 1501. In this embodiment, the display
panels 1550 within a single display system 1500 may be served from
different locations. For example, a larger part of the screen may
show an advertisement from a media server whereas a lower portion
may show the temperature from a weather server or a sports score
from a sport network server.
[0094] In one or more embodiments, each of the display panel 1550
may include a monitoring circuit for monitoring the status of one
or more panels.
[0095] FIG. 16 illustrates an alternative embodiment of the present
invention in which each display panel has a unique IPV6 IP
address.
[0096] In this embodiment, each display panel 1650 of the display
system 1600 has a unique IP address, for example, an IPV6 IP
address. The media to be displayed may be split at the source of a
single media server or may be obtained from multiple media server
through the internet. For example, different portions of the
display system 1600 may be leased to a different company displaying
its own content. This embodiment enables multiple users to share a
single display board. For example, an expensive display location
may be shared in time or space by multiple companies reducing their
costs while improving effectiveness of the display. The display
panels may be powered individually or through Power over Ethernet
technologies using cat5, cat6 cables.
[0097] In one or more embodiments, each of the display panel 1650
may include a monitoring circuit for monitoring the status of one
or more panels.
[0098] Embodiments of the invention provide a display panels, each
of which provides a completely self-contained building block that
is lightweight. These displays are designed to protect against
weather, without a heavy cabinet. The panel can be constructed of
aluminum or plastic so that it will about 50% lighter than typical
panels that are commercially available. The lightweight design
allows for easier installation and maintenance, thus lowering total
cost of ownership.
[0099] In certain embodiments, the display is IP 67 rated and
therefore waterproof and corrosion resistant. Because weather is
the number one culprit for damage to LED displays, and IP 67 rating
provides weatherproofing with significant weather protection. These
panels are completely waterproof against submersion in up to 3 feet
of water. In other embodiments, the equipment can be designed with
an IP 68 rating to operate completely underwater. In lower-cost
embodiments where weatherproofing is not as significant, the panels
can have an IP 65 or IP 66 rating.
[0100] One aspect takes advantage of a no cabinet design-new
technology that replaces cabinets, which are necessary in
commercial embodiments. Older technology incorporates the use of
cabinets in order to protect the LED display electronics from rain.
This creates an innate problem in that the cabinet must not allow
rain to get inside to the electronics, while at the same time the
cabinet must allow for heat created by the electronics and ambient
heat to escape.
[0101] Embodiments that the do not use this cabinet technology
avoid a multitude of problems inherent to cabinet-designed
displays. One of the problems that has been solved is the need to
effectively cool the LED display. Most LED manufacturers must use
air-conditioning (HVAC) to keep their displays cool. This
technology greatly increases the cost of installation and
performance.
[0102] Displays of the present invention can be designed to be
light weight and easy to handle. For example, the average total
weight of a 20 mm, 14'.times.48' panel can be 5,500 pounds or less
while typical commercially available panels are at 10,000 to 12,000
pounds. These units are more maneuverable and easier to install
saving time and money in the process.
[0103] Embodiments of the invention provide building block panels
that are configurable with future expandability. These displays can
offer complete expandability to upgrade in the future without
having to replace the entire display. Installation is fast and easy
with very little down-time, which allows any electronic message to
be presented more quickly.
[0104] In some embodiments, the display panels are "hot swappable."
By removing one screw in each of the four corners of the panel,
servicing the display is fast and easy. Since a highly-trained,
highly-paid electrician or LED technician is not needed to correct
a problem, cost benefits can be achieved.
[0105] Various embodiments utilize enhanced pixel technology (EPT),
which increases image capability. EPT allows image displays in the
physical pitch spacing, but also has the ability to display the
image in a resolution that is four-times greater. Images will be as
sharp and crisp when viewed close as when viewed from a distance,
and at angles.
[0106] In some embodiments is advantageous to build multipanel
displays where each of the LEDs is provided by a single LED
manufacturer, so that diodes of different origin in the manufacture
are not mixed. It has been discovered that diode consistency can
aid in the quality of the visual image. While this feature is not
necessary, it is helpful because displays made from different
diodes from different suppliers can create patchy inconsistent
color, e.g., "pink" reds and pink looking casts to the overall
image.
[0107] While this invention has been described with reference to
illustrative embodiments, this description is not intended to be
construed in a limiting sense. Various modifications and
combinations of the illustrative embodiments, as well as other
embodiments of the invention, will be apparent to persons skilled
in the art upon reference to the description. It is therefore
intended that the appended claims encompass any such modifications
or embodiments.
* * * * *